这个算法还搞不定。LuciferStar给我参考的...怕自己忘了,先写出来。 ----------- sqrt (PHP 3, PHP 4 ) sqrt -- 平方根 说明 float sqrt ( float arg) 返回 arg 的平方根。 ?php // Precision depends on your precision directive echo sqrt(9)
这个算法还搞不定。LuciferStar给我参考的...怕自己忘了,先写出来。
-----------
sqrt
(PHP 3, PHP 4 )
sqrt -- 平方根
说明
float sqrt ( float arg)
返回 arg 的平方根。
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>
参见 pow()。
------------

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